Standard brick material prepared by taking phosphogypsum as raw material and preparation method of standard brick

Abstract

The invention provides a standard brick material prepared by taking phosphogypsum as a raw material and the preparation method of the standard brick. The weight percentage of the raw materials of the standard brick is as follows: 35% to 55% of slate, 30% to 45% of phosphogypsum and 10% to 20% of powdered coal. The technological process comprises material preparation, primary crushing, fine crushing, screening, storing seasoning, primary refining, secondary refining, extrusion moulding, loading, drying, sinter moulding, grading and boxing. As a result, the final finished standard brick is produced. The preparation method provided by the invention solves the problem about comprehensive utilization of the waste phosphogypsum in the current phosphorous fertilizer plants and the technical problem that the standard brick sample produced through the existing technology and proportioning has low strength and poor sintering performance. The technical raw materials provided by the invention improve low-temperature forming performance and high-temperature sintering performance, and ensures that CaSO4 participates in the sintering reaction to the utmost extent during the high-temperature sintering process.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a standard brick material prepared from phosphogypsum as a raw material and a preparation method of the standard brick. Background technique [0002] The slag discharged from the production of phosphate fertilizer plants is mainly composed of gypsum. Its structure is loose, also known as phosphogypsum. At present, the country can produce more than 5 million tons per year. Due to its high water content, phosphogypsum and its iron oxide crystals are fine, such as sludge Similarly, it is difficult to pile up high. According to 1.3 tons / cubic, the height is 20 meters, and it can occupy 300 mu of land every year, which brings great difficulties to environmental protection and resource utilization. Since the main component of the tailings is 2-hydrate gypsum with high iron content and high water content, and it is a non-radioactive substance, the trace elements have not ex...

AI Technical Summary

Problems solved by technology

[0004] 1) The strength of the sample is low, even breaking when pinched;

[0005] 2) The loss on ignition is too large, the largest being 20-30%;

[0006] 3) Poor sintering performance, rough surface and high porosity;

[0007] 4) The color does not conform to the popular aesthetic color of bricks and blocks;

[0009] 6) There are also many problems in low-temperature forming, such as low strength of the green body, easy cracking, slow drying speed, etc.